15. Simplify the expression cos (r)+cos²(r) tan²(r); (hint: you may write the expression in terms of sine and cosine only, then simplify).
15. Simplify the expression cos (r)+cos²(r) tan²(r); (hint: you may write the expression in terms of sine and cosine only, then simplify).
Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE:
1. Give the measures of the complement and the supplement of an angle measuring 35°.
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Transcribed Image Text:**Problem 15:** Simplify the expression \( \cos^2(x) + \cos^2(x) \tan^2(x) \); (hint: you may write the expression in terms of sine and cosine only, then simplify).
Options:
- i) 1
- ii) 2
- iii) \( \cot^2(x) \)
- iv) not listed
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